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////given
V1=.82 //volts
V2=1.85 //volts
lembda1=4.0*10**-7 //m
lembda2=3.0*10**-7
e=1.6*10**-19
c=3.0*10**8 //m/s
//Calculation
lembda=(1/lembda2)-(1/lembda1)
h=(e*(V2-V1))/(c*lembda)
//Result
printf("\n (a) planks constant %e Js",h)
printf("\n (b) no, because the stopping potential depends only on the wavelength of light and not on its intensity.")
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